With Air Conditioning
A/C HEATER CONTROL ASSEMBLYA/C-Heater Control Assembly:
The control assembly consists of three main parts:
1. The function selector knob - a vacuum selector valve combined with an internal electrical switch.
A/C System Schematic And Vacuum Control Chart:
a. The vacuum selector valve directs source vacuum to various vacuum motors.
b. Two internal single pole electrical switches are also controlled by the selector.
c. The combination of these electrical switches controls the electrical supply to the A/C clutch and the blower switch.
2. Blower switch - an electrical switch that provides four speeds of blower operation.
3. The temperature control knob - which controls the position of the electric blend door actuator mounted on the evaporator assembly.
a. The temperature control knob is electrically connected to the temperature blend door by a blend door actuator.
b. Movement of the control knob from COOL to WARM causes a corresponding movement on the temperature blend door and determines the temperature that the system will maintain.